Medicare Advantage in Marion County, Indiana
93,601 people in Marion County, Indiana were enrolled in Medicare Advantage in October 2026, 58.5% of 160,088 eligible beneficiaries (+0.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 33% of reported enrollment; 16 parent organizations have 11 or more members and the HHI is 2,480 (highly concentrated). For 2027, 1,482 members here are in plans that terminate or leave the county. MA plans offered go from 49 to 45.
Parent organizations in Marion County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 30,626 | −1 | 32.9% |
| Humana Inc. | 28,181 | +2,683 | 30.2% |
| Elevance Health, Inc. | 19,485 | −4,347 | 20.9% |
| Zing Health Consolidator, Inc | 4,446 | +1,688 | 4.8% |
| CVS Health Corporation | 3,314 | −679 | 3.6% |
| Devoted Health, Inc. | 2,094 | new | 2.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 1,790 | −105 | 1.9% |
| Centene Corporation | 1,210 | +445 | 1.3% |
| SIHO Holding, Inc. | 940 | +497 | 1.0% |
| Rifkin Managed Care Holding, LLC | 642 | −31 | 0.7% |
| SNP Holdings, LLC | 176 | +17 | 0.2% |
| Franciscan Alliance, Inc. | 94 | +7 | 0.1% |
| Ascension Health Alliance | 64 | +18 | under 0.1% |
| Highmark Health | 56 | −1 | under 0.1% |
| Mitchell Family Office | 37 | 0 | under 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 22,459 beneficiaries in Marion County were assigned to 137 Medicare Shared Savings Program ACOs, 49.6% of assignable Original Medicare beneficiaries. Together, roughly 79% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.